Kloubová oka Fluro

23 FLURO ® -Gelenklager GmbH Calculation Examples 2. Example: In a mechanical handling facility multi-directional radial loads are applied to the rod end. These loads are the same as shown in illustration 4, page 19. Four separate loads F r, i with the four appropriate time components have been substituted as shown below: F r1 = 2 kN, t 1 = 50%; F r2 = 4 kN, t 2 = 16%; F r3 = 2,4 kN, t 3 = 24%; F r4 = 1 kN, t 4 = 10%; Additionally the rod end is subjected to a constant axial load F a = 0,65 kN Further operating conditions: max. angle ß = 30 º ; oscillation frequency f = 60/min.; max. temperature 70 º C 1. initial selection of Rod End a) Type of As regular lubrication is not possible due to poor accessibility a maintenance free type must be bearing used. Rod Ends GASW, GAXSW, GARSW, GAOW could be suitable, but the following series have to be ruled out. - GAOW - these Rod Ends are only suitable for restricted movement. - GARSW - because the working environment is not corrosive. This leaves the size of the male thread version of type GASW to be established. b) Size b 0 ) mean and equivalent bearing load [formula 3 + 4 + table 2] F m = 0,1 ∑ F i 2 . t i = 0,1 2 2 . 50 + 4 2 . 16 + 2,4 2 . 24 + 1 2 . 10 = 2,46 kN F e = F m + Y . F a = 2,46 + 1,26 . 0,65 = 3,28 kN Y = 1,26 for F a /F m = 0,65/2,46 = 0,26 b 1 ) required static load rating C o [formula 7 + picture 1 + table 4] C o, req ≥ F exist, e = 3,28 = 6,56 kN f B . f T 0,5 . 1 b 2 ) required dynamic load rating C [formula 5a + table 3] C req ≥ (C/F) min . F exist = 1,75 . 3,28 = 5,75 kN c) Bearing selected GASW 12 with d k = 22,2 mm and C o = 23,5 kN C = 32,0 kN Check [formula 6 + 6a] C o, exist = 23,5 kN > C o, req = 6,56 kN F r2 = 4,00 kN ≤ F r, max = C o . f B . f T = 23,5 . 0,5 . 1 = 11,75 kN C exist = 32,0 kN > C req = 5,75 kN F a = 0,65 kN ≤ F a, max = a . F r, max = 0,2 . 11,75 = 2,35 kN [a = 0,2 see formula 1] Note: When selecting the size the dynamic load C req should not exceed the static load C o, exist 2. Checking the surface pressure [formula 8 + table 1] p exist = p max = 150 = 150 = 15,38 N/mm 2 < p max = 150 N/mm 2 (C/F) exist 32,0/3,28 9,75 3. Checking the slip speed [formula 9 + table 5] v m, exist = d k . ß . f = 22,2 . 30 . 60 = 0,011 m/s < v max = 0,25 m/s 1000 . 57,3 . 60 1000 . 57,3 . 60 4. Checking the specific bearing performance [formula 10 + table 6] P L, exist = p exist . v m, exist = 15,38 . 0,011 = 0,17 W/mm 2 < P L, max = 1,3 W/mm 2 5. Calculation of bearing life [formula 11 + table 7 + 4 + 8 + 9] G h ≈ 3 . f L . f T . f G . f V . C/F = 3 . 1 . 1 . 4,2 . 1 9,75 = 11.100 hrs. v m exist 0,011 6. Final selection Steps 1c to 5 can then be repeated for series GAXSW so that after comparing the required material strength, price etc. of each type, a final decision can be taken. ( )